Build an AI Lead Scoring API with Next.js 15 and Gemini

This tutorial shows how to create a lightweight API using Next.js 15 and Gemini 3.5 Flash that automatically scores and prioritizes incoming leads. The API returns a score, priority level, and reason for each lead, enabling faster response to high-value prospects. It can be integrated with CRMs, chatbots, or automation workflows to reduce manual review and improve sales efficiency.